Minimally-invasive pancreatic surgery in high volume centers in the Czech Republic - current status and possible implementations.

INTRODUCTION: Minimally-invasive surgical methods have been becoming ever more common also in the segment of pancreatic surgery. The aim of this paper was to analyze the current state of minimally-invasive surgery in the Czech Republic and the justification and potential of implementing such procedures. METHODS: Analysis of high volume centers using healthcare providers´ and payers´ data. RESULTS: Thirteen pancreatic surgical centers meet the proposed criteria for being called a high volume center - a center of highly specialized care in pancreatic surgery based on the annual number of at least 17 major resections of the pancreas. According to data from healthcare payers, laparoscopy was used in 0.6%-65.7% of procedures in individual centers. However, these are not resection procedures. The centers themselves report a significantly smaller number of minimally-invasive pancreatic resection procedures. The actual numbers of minimally-invasive resection procedures in the current system are practically impossible to verify. The potential for implementing minimally-invasive pancreatic surgery in the Czech Republic can be estimated based on the identification of candidate patients. CONCLUSION: Due to the fragmentation of this operative segment, its costs and small numbers of patients suitable for minimally-invasive pancreatic surgery even among high volume centers, the implementation rate of these methods is very slow. The need to centralize this segment of care appears to be very urgent from all points of view.

Laparoscopic liver resections - state of art.

Progress had been made in the miniinvasive surgery in the past 30 years. Laparoscopic liver procedures were expanded from limited resections to major resection and complicated procedures. Miniinvasive approach offered better short-time results and similar oncological outcomes compared with open liver surgery. However, it is still challenging to perform some difficult procedures laparoscopically which requires a learning curve and accumulation of experiences in specialized centers.

[Iatrogenic biliary tract lesions requiring surgical reconstruction - presentation and classification of the lesions, their reconstruction and evaluation of the results]. / Iatrogénne lézie zlcových ciest vyzadujúce chirurgickú rekonstrukciu prezentácia a klasifikácia poranení, spôsob rekonstrukcie, hodnotenie výsledkov.

INTRODUCTION: The incidence of biliary duct injuries requiring surgical reconstruction has stabilised between 0.30.7%. Biliary reconstruction in the hands of a trained hepatobiliary surgeon may lead to better short- and long-term outcomes in patients with this infrequent, but serious complication. METHODS: This study presents a retrospective analysis of single surgeon experience with biliary injury repair during the period of 20072016. Extramucosal hepaticojejunostomy on the excluded segment of the jejunal loop was performed without the use of any transanastomotic drain. Immediate reconstruction of on-table recognised injuries was carried out; patients presenting with biliary leak were reconstructed early and patients presenting with biliary stricture underwent reconstruction depending on the degree of obstruction, presence of cholangitis and feasibility of endoscopic or percutaneous intervention. Postoperative complications were evaluated using Dindo-Clavien and ISGLS classification, and the effect of reconstruction was assessed according to McDonald criteria. RESULTS: 15 biliary reconstructions in 14 patients were performed during the study period. More than a half of the patients experienced some postoperative complication (53.33%); serious complication occurred in 2 patients. One patient (82 years old) died of non-surgical postoperative complications. Biliary leak occurred in three patients (20%), and deep surgical site infection (fasciitis) in four patients (33.33%). The average length of stay was 12.13 days. There was no revisional surgery during the index hospitalisation in any of the patients. There were two readmissions up to 90 days after biliary reconstruction (13.33%). The patients are currently followed up for an average of 4.01 years; compliance with follow-up is 100%. Successful reconstruction was achieved in 92.86% of patients; one patient required rehepaticojejunostomy (7.14%). According to McDonald criteria excellent results were accomplished in 6 patients (42.86%), good results in another 5 patients (35.71%) and 2 patients underwent percutaneous intervention on the reconstruction (14.28%). CONCLUSION: When comparing results among various centres, we should take into account: 1. Experience of the centre/surgeon; 2. Case-mix (exact classification); 3. Timing of reconstruction; 4. Criteria for successful reconstruction; and 5. The length of follow-up. Patients in our centre who fulfil McDonald A and B criteria during the whole follow-up period are considered to have a successful repair. Reconstruction in McDonald C patients is also considered as a success by some authors, although this remains debatable as an early intervention on the reconstruction may be appropriate.Key words: cholecystectomy - bile duct injury - hepaticojejunostomy stricture.

[Reverse strategy for synchronous colorectal liver metastases Therapeutic protocol completion, 3-year survival and progression pattern in 32 patients]. / Reverzný prístup k synchrónnym pecenovým metastázam kolorektálneho karcinómuAbsolvovanie liecebného protokolu, strednodobé (trojrocné) prezívanie a vzorec progresie ochorenia u 32 pacientov.

INTRODUCTION: Reverse, liver-first strategy is an alternative for patients with complicated liver metastases where disease progression would prove inoperable, or for patients with locally advanced pelvic disease where postoperative complications after primary tumour resection may lead to delayed treatment of metastatic disease. METHODS: Retrospective unicenter analysis of 32 patients approached liver-first approach between 2011 and 2015. During this period reverse strategy was considered a preferred approach for all initially or potentially resectable synchronous colorectal liver metastases based on multidisciplinary team consensus. RESULTS: 26 patients (81.3%) completed their surgical plan (hepatectomy and primary tumour resection) but only 16 (50%) completed their oncosurgical plan (hepatectomy, primary tumour resection and full dose and length of perioperative or adjuvant systemic (bio)chemotherapy). Median overall survival was 50.5 months with the survival rate of 83.7% at 3 years. 20 patients (62.5%) progressed during the follow-up with median time to progression of 21.6 months. The liver was the most common site of recurrent disease followed by the lungs (65% and 20% of all recurrences, respectively). CONCLUSION: While reverse strategy may allow complete tumour removal in the majority of patients, only half of them complete their oncosurgical plan even with the liver-first approach. The most problematic aspect of the liver-first strategy is the timing and length of perioperative (bio)chemotherapy. When deciding on preoperative chemotherapy in up-front resectable lesions one should take into account the risk of disease progression while on chemotherapy as well as the risks of complete radiologic response. KEY WORDS: colorectal carcinoma reverse strategy liver-first approach liver metastases.

[Current status regarding surgical treatment of pancreatic cancer in the Czech Republic]. / Aktuální stav chirurgické lécby karcinomu pankreatu v Ceské republice.

INTRODUCTION: The aim is to map the current situation in the surgical treatment of pancreatic cancer in the Czech Republic. This information has been obtained from surgical treatment providers using a simple questionnaire and by identifying the so called high volume centres. The information has been collected in the interest of organizing and planning research projects in the field of pancreatic cancer treatment. METHOD: We addressed centres known to provide surgical treatment of pancreatic cancer. A simple questionnaire formulated one question about the total number of pancreatic resections, also separately for the diagnoses PDAC - C25, in the last two years (2014 and 2015). Other questions focused on the use of diagnostic methods, neoadjuvant therapy, preoperative assessment of risks, the possibility of rapid intraoperative histopathology examination, Leeds protocol, monitoring of morbidity and mortality including long-term results, and the method of postoperative follow-up and treatment. ÚZIS (Institute of Health Information and Statistics of the Czech Republic) was addressed with a request to analyze the frequency of reported total numbers for DPE, LPE, TPE and to do the same with respect to diagnosis C 25 for the last two years, available for the entire Czech Republic (2013, 2014). RESULTS: Altogether 19 institutions were identified by the preceding audit, which reported more than 10 pancreatic resections annually; these institutions were addressed with the questionnaire. Sixteen institutions responded to the questions, 13 of them completely. CONCLUSION: The majority of potentially radical surgeries for PDAC in the Czech Republic are carried out at 6 institutions. All of the institutions that participated in the survey collect data about morbidity and mortality and monitor their results. KEY WORDS: pancreas cancer outcomes surgery.

Performance of CT ASPECTS and Collateral Score in Risk Stratification: Can Target Perfusion Profiles Be Predicted without Perfusion Imaging?

BACKGROUND AND PURPOSE: Endovascular trials suggest that revascularization benefits a subset of acute ischemic stroke patients with large-artery occlusion and small-core infarct volumes. The objective of our study was to identify thresholds of noncontrast CT-ASPECTS and collateral scores on CT angiography that best predict ischemic core volume thresholds quantified by CT perfusion among patients with acute ischemic stroke. MATERIALS AND METHODS: Fifty-four patients with acute ischemic stroke (<12 hours) and MCA/intracranial ICA occlusion underwent NCCT/CTP during their initial evaluation. CTP analysis was performed on a user-independent platform (RApid processing of PerfusIon and Diffusion), computing core infarct (defined as CBF of <30% normal). A target mismatch profile consisting of infarction core of ≤50 mL was selected to define candidates with acute ischemic stroke likely to benefit from revascularization. RESULTS: NCCT-ASPECTS of ≥9 with a CTA collateral score of 3 had 100% specificity for identifying patients with a CBF core volume of ≤50 mL. NCCT-ASPECTS of ≤6 had 100% specificity for identifying patients with a CBF core volume of >50 mL. In our cohort, 44 (81%) patients had an NCCT-ASPECTS of ≥9, a CTA collateral score of 3, or an NCCT-ASPECTS of ≤6. CONCLUSIONS: Using an NCCT-ASPECTS of ≥9 or a CTA collateral score of 3 best predicts CBF core volume infarct of ≤50 mL, while an NCCT-ASPECTS of ≤6 best predicts a CBF core volume infarct of >50 mL. Together these thresholds suggest that a specific population of patients with acute ischemic stroke not meeting such profiles may benefit most from CTP imaging to determine candidacy for revascularization.

[Evaluation in medical residency training programs]. / Evaluation in der Assistenzarztausbildung.

BACKGROUND: For resident doctors the acquisition of technical and professional competence is decisive for the successful practice of their activities. Competency and professional development of resident doctors benefit from regular self-reflection and assessment by peers. While often promoted and recommended by national educational authorities, the implementation of a robust evaluation process in the clinical routine is often counteracted by several factors. OBJECTIVE: The aim of the study was to test a self-developed digital evaluation system for the assessment of radiology residents at our institute for practicality and impact with regard to the radiological training. MATERIAL AND METHODS: The intranet-based evaluation system was implemented in January 2014, which allowed all Radiology consultants to submit a structured assessment of the Radiology residents according to standardized criteria. It included 7 areas of competency and 31 questions, as well as a self-assessment module, both of which were filled out electronically on a 3-month basis using a 10-point scale and the opportunity to make free text comments. The results of the mandatory self-evaluation by the residents were displayed beside the evaluation by the supervisor. Access to results was restricted and quarterly discussions with the residents were conducted confidentially and individually. RESULTS AND DISCUSSION: The system was considered to be practical to use and stable in its functionality. The centrally conducted anonymous national survey of residents revealed a noticeable improvement of satisfaction with the institute assessment for the criterion "regular feedback"compared to the national average. Since its implementation the system has been further developed and extended and is now available for other institutions.

Performance and Predictive Value of a User-Independent Platform for CT Perfusion Analysis: Threshold-Derived Automated Systems Outperform Examiner-Driven Approaches in Outcome Prediction of Acute Ischemic Stroke.

BACKGROUND AND PURPOSE: Treatment strategies in acute ischemic stroke aim to curtail ischemic progression. Emerging paradigms propose patient subselection using imaging biomarkers derived from CT, CTA, and CT perfusion. We evaluated the performance of a fully-automated computational tool, hypothesizing enhancements compared with qualitative approaches. The correlation between imaging variables and clinical outcomes in a cohort of patients with acute ischemic stroke is reported. MATERIALS AND METHODS: Sixty-two patients with acute ischemic stroke and MCA or ICA occlusion undergoing multidetector CT, CTA, and CTP were retrospectively evaluated. CTP was processed on a fully operator-independent platform (RApid processing of PerfusIon and Diffusion [RAPID]) computing automated core estimates based on relative cerebral blood flow and relative cerebral blood volume and hypoperfused tissue volumes at varying thresholds of time-to-maximum. Qualitative analysis was assigned by 2 independent reviewers for each variable, including CT-ASPECTS, CBV-ASPECTS, CBF-ASPECTS, CTA collateral score, and CTA clot burden score. Performance as predictors of favorable clinical outcome and final infarct volume was established for each variable. RESULTS: Both RAPID core estimates, CT-ASPECTS, CBV-ASPECTS, and clot burden score correlated with favorable clinical outcome (P < .05); CBF-ASPECTS and collateral score were not significantly associated with favorable outcome, while hypoperfusion estimates were variably associated, depending on the selected time-to-maximum thresholds. Receiver operating characteristic analysis demonstrated disparities among tested variables, with RAPID core and hypoperfusion estimates outperforming all qualitative approaches (area under the curve, relative CBV = 0.86, relative CBF = 0.81; P < .001). CONCLUSIONS: Qualitative approaches to acute ischemic stroke imaging are subject to limitations due to their subjective nature and lack of physiologic information. These findings support the benefits of high-speed automated analysis, outperforming conventional methodologies while limiting delays in clinical management.

Descending and tonotopic projection patterns from the auditory cortex to the inferior colliculus.

The inferior colliculus (IC) receives many corticofugal projections, which can mediate plastic changes such as shifts in frequency tuning or excitability of IC neurons. While the densest projections are found in the IC's external cortices, fibers originating from the primary auditory cortex (AI) have been observed throughout the IC's central nucleus (ICC), and these projections have shown to be organized tonotopically. Some studies have also found projections from other core and non-core cortical regions, though the organization and function of these projections are less known. In guinea pig, there exists a non-core ventrorostral belt (VRB) region that has primary-like properties and has often been mistaken for AI, with the clearest differentiating characteristic being VRB's longer response latencies. To better understand the auditory corticofugal descending system beyond AI, we investigated if there are projections from VRB to the ICC and if they exhibit a different projection pattern than those from AI. In this study, we performed experiments in ketamine-anesthetized guinea pigs, in which we positioned 32-site electrode arrays within AI, VRB, and ICC. We identified the monosynaptic connections between AI-to-ICC and VRB-to-ICC using an antidromic stimulation method, and we analyzed their locations across the midbrain using three-dimensional histological techniques. Compared to the corticocollicular projections to the ICC from AI, there were fewer projections to the ICC from VRB, and these projections had a weaker tonotopic organization. The majority of VRB projections were observed in the caudal-medial versus the rostral-lateral region along an isofrequency lamina of the ICC, which is in contrast to the AI projections that were scattered throughout an ICC lamina. These findings suggest that the VRB directly modulates sound information within the ascending lemniscal pathway with a different or complementary role compared to the modulatory effects of AI, which may have implications for treating hearing disorders.

Up front hepatectomy for metastatic rectal carcinoma - reversed, liver first approach. Early experience with 15 patients.

Timing and sequence of therapeutic interventions in patients with colorectal cancer (CRC) and synchronous liver metastases is a matter of ongoing discussion. The aim of this report is to show the feasibility and safety of a reversed strategy in patients with up front resectable synchronous liver metastases. Consecutive series of 15 patients with locally advanced rectal carcinoma and liver synchronous metastases where up front liver resection was carried out as an initial intervention is presented. Local treatment of both, metastatic disease and primary tumor, was preferred. Liver resection was followed by neoadjuvant (preoperative) concomitant radiochemotherapy (RCT) for local pelvic disease control and subsequent resection of rectum. Systemic adjuvant chemotherapy was placed at the end of the entire treatment cycle. All 15 patients after up front hepatectomy were able to proceed with their treatment plan. 14 patients completed their RCT for primary tumor and subsequent rectal resection was successfully carried out. In 12 of them. 3 patients showed complete clinical response on cross sectional imaging and a careful "wait-and-see" policy was adopted for them. In two patients metastatic disease progression was noticed during the treatment cycle.Liver first approach in patients with up front resectable colorectal liver metastases (CRLM) is safe and feasible. Local neoadjuvant treatment after CRLM resection may result in preoperative downsizing or even complete clinical response of the primary tumor. Reversed strategy may to a degree eliminate negative oncologic impact of surgical complications after rectal surgery as CRLM has been already addressed.

[Colon cancer - evaluation of complications and risks of planned resections]. / Karcinom tlustého streva - zhodnocení komplikací a rizik plánovaných resekcních výkonu

INTRODUCTION: Resection procedures for colorectal cancer are burdened with a relatively high number of complications. The aim of this study is to define risk factors associated with the development of postoperative complications based on retrospective data analysis. MATERIAL AND METHODS: From January 1 st 2007 to December 31st 2012, 1093 patients underwent surgery for colorectal cancer. Retrospectively, we selected a group of 406 patients who underwent planned, elective colon resection for colon cancer. Open surgery was performed in 158 patients (38.9%), laparoscopic resection in 248 patients (61.1%). Based on initial staging of the disease, there were 85 patients (20.9%) in stage I, 137 patients (33.8%) in stage II, 110 patients (27.1%) in stage III and 74 patients (18.2%) in stage IV. Postoperative complications were evaluated according to Clavien - Dindo classification. RESULTS: Grade I complications were observed in 34 patients (8.4%), grade II in 25 patients (6.2%), grade III in 43 patients (10.6%), grade IV in 7 patients (1.7%) and grade V in 8 patients (2.0%). The highest incidence of complications was observed in left colon resection procedures (41.1%), open resections (39.8%), procedures lasting longer than 301 minutes (50%), patients older than 81 years (41.6%) and in procedures performed by the youngest, less experienced surgeon (40.6%). CONCLUSION: Our results confirmed that the type and approach of surgical procedure, patients age and surgeons experience are risk factors associated with a higher incidence of postoperative complications. High-risk surgical patients should be operated on by experienced surgeon who regularly performs a high number of resection procedures.

Diffusion-weighted imaging with dual-echo echo-planar imaging for better sensitivity to acute stroke.

BACKGROUND AND PURPOSE: Parallel imaging facilitates the acquisition of echo-planar images with a reduced TE, enabling the incorporation of an additional image at a later TE. Here we investigated the use of a parallel imaging-enhanced dual-echo EPI sequence to improve lesion conspicuity in diffusion-weighted imaging. MATERIALS AND METHODS: Parallel imaging-enhanced dual-echo DWI data were acquired in 50 consecutive patients suspected of stroke at 1.5T. The dual-echo acquisition included 2 EPI for 1 diffusion-preparation period (echo 1 [TE = 48 ms] and echo 2 [TE = 105 ms]). Three neuroradiologists independently reviewed the 2 echoes by using the routine DWI of our institution as a reference. Images were graded on lesion conspicuity, diagnostic confidence, and image quality. The apparent diffusion coefficient map from echo 1 was used to validate the presence of acute infarction. Relaxivity maps calculated from the 2 echoes were evaluated for potential complementary information. RESULTS: Echo 1 and 2 DWIs were rated as better than the reference DWI. While echo 1 had better image quality overall, echo 2 was unanimously favored over both echo 1 and the reference DWI for its high sensitivity in detecting acute infarcts. CONCLUSIONS: Parallel imaging-enhanced dual-echo diffusion-weighted EPI is a useful method for evaluating lesions with reduced diffusivity. The long TE of echo 2 produced DWIs that exhibited superior lesion conspicuity compared with images acquired at a shorter TE. Echo 1 provided higher SNR ADC maps for specificity to acute infarction. The relaxivity maps may serve to complement information regarding blood products and mineralization.

[Anterior cruciate ligament injuries in children and adolescents in our patient group]. / Poranení predního zkrízeného vazu u deti a adolescentu v nasem souboru pacientu.

PURPOSE OF THE STUDY: Today arthroscopy remains the principal method in both the diagnosis and the therapy of knee injuries also in children and adolescents because serious knee ligament injuries, including those to the anterior cruciate ligament (ACL), are not rare in childhood. According to many authors, consequences of knee instability in children are more serious than in adults. MATERIAL AND METHODS: In 713 patients treated by arthroscopy for knee joint injuries at our department between 2000 and 2010, ACL injury ranked fifth among knee injuries and was found in 85 patients (12%). All patients in this group were under 19 years of age. The average age at the time of arthroscopic surgery was 15 years and 3 months. The patients were followed up at regular intervals for the symptoms and signs of anterior knee instability. Skeletal maturity achieved by the final follow-up (in 2010) was recorded in 69 (82%) of them. RESULTS: Of the 85 patients with ACL injury, 50 subsequently underwent ACL reconstruction. This procedure was used only when they achieved skeletal maturity. Correlation between pre-operative clinical diagnosis and arthroscopic findings was found only in 52% of the patients. DISCUSSION: The problem of anterior knee instability in children and adolescents still remains unsolved. Although surgical procedures for ACL reconstruction in skeletally immature patients have been described, most of the authors support the option of ACL reconstruction at the age of skeletal maturity. This view is also maintained by our team. CONCLUSIONS: The aim of this study was to draw attention to ACL injuries and resulting knee instability in children and adolescents.

[Treatment of sequelae after Monteggia lesions in childhood]. / Resení následku Monteggiovy zlomeniny v detském veku.

PURPOSE OF THE STUDY: To review the current methods of operative management of post-traumatic chronic radial head dislocation in chronic Monteggia lesions in children. MATERIAL AND METHODS: Post-traumatic chronic dislocation of the proximal radius usually occurs following missed or ineffectively treated Monteggia fractures. The radial head is usually dislocated anteriorly. We performed open reduction of the radial head, reconstruction of the annular ligament and corrective osteotomy of the ulna in eleven patients. Three of our patients underwent ulnar lengthening via gradual distraction using an Ilizarov external fixator. This procedure was used in nine boys and five girls who were treated for complications following Monteggia lesions between 2000 and 2009. The average age at the time of surgery was 8 years and 4 months, the average injury-to-surgery interval was 19 months, and a prerequisite for surgery was a normal concave articular surface of the proximal radius. The patients were followed up for an average of 28 months and, at final follow-up, all were fully active and had no pain or instability. RESULTS: The complications included: non-union of the ulnar osteotomy site in two patients, residual radiocapitellar subluxation in two patients, and one patient had revision surgery. Nine patients showed a full range of motion, two had a loss of extension, and three had a mean loss of pronation of 20 degrees and a mean loss of supination of 20 degrees. DISCUSSION: The Monteggia lesion is a rare fracture in childhood, but its sequelae can be serious. So far a unified therapeutic approach has not been proposed. Most authors prefer reconstruction surgery. Our results are in full agreement with the published data. CONCLUSIONS: The operative treatment of consequences after Monteggia fractures in children has a relatively high rate of complications and unpredictable results. Indications for reconstruction involve a normal articular surface of the radial head and a normal alignment of the radius and ulna. Key words: Monteggia fracture, consequences, reconstruction surgery, childhood.

Clinical assessment of standard and generalized autocalibrating partially parallel acquisition diffusion imaging: effects of reduction factor and spatial resolution.

BACKGROUND AND PURPOSE: PI improves routine EPI-based DWI by enabling higher spatial resolution and reducing geometric distortion, though it remains unclear which of these is most important. We evaluated the relative contribution of these factors and assessed their ability to increase lesion conspicuity and diagnostic confidence by using a GRAPPA technique. MATERIALS AND METHODS: Four separate DWI scans were obtained at 1.5T in 48 patients with independent variation of in-plane spatial resolution (1.88 mm(2) versus 1.25 mm(2)) and/or reduction factor (R = 1 versus R = 3). A neuroradiologist with access to clinical history and additional imaging sequences provided a reference standard diagnosis for each case. Three blinded neuroradiologists assessed scans for abnormalities and also evaluated multiple imaging-quality metrics by using a 5-point ordinal scale. Logistic regression was used to determine the impact of each factor on subjective image quality and confidence. RESULTS: Reference standard diagnoses in the patient cohort were acute ischemic stroke (n = 30), ischemic stroke with hemorrhagic conversion (n = 4), intraparenchymal hemorrhage (n = 9), or no acute lesion (n = 5). While readers preferred both a higher reduction factor and a higher spatial resolution, the largest effect was due to an increased reduction factor (odds ratio, 47 ± 16). Small lesions were more confidently discriminated from artifacts on R = 3 images. The diagnosis changed in 5 of 48 scans, always toward the reference standard reading and exclusively for posterior fossa lesions. CONCLUSIONS: PI improves DWI primarily by reducing geometric distortion rather than by increasing spatial resolution. This outcome leads to a more accurate and confident diagnosis of small lesions.

Oral manifestations of diabetes mellitus and influences of periodontological treatment on diabetes mellitus.

The aim of this review was to describe and determine the oral manifestation of DM and influences of periodontological treatment on DM. Diabetes mellitus (DM) is one of the most serious diseases of metabolism. Long-term consequences of hyperglycemia are very heterogeneous, and affect practically all tissues and organs of organism. Classical signs and symptoms of DM are polyphagia, polyuria, polydipsia, physical weakness, and decreased immunity against infections. Untreated and fully developed DM results in numerous complications, of which the most serious include nephropathies, retinopathies, myopathies, neuropathies, cardiovascular diseases, bad wound healing and disorders of microvascularity and macrovascularity. Oral manifestations of DM are of different types and they affect various tissues of this region. Summarizing and comparing the literature data were used to obtain these goals. From the etiopathogenetic viewpoint, we can state that the so far best-investigated oral complication is that of diabetic periodontitis and its consequences, including early teeth loss. Uncontrolled hyperglycemia deteriorates the periondontal status to the extent of developing into a clinical picture of diabetic periodontitis. On the other hand, it is to be noted that not all researchers have confirmed that the treatment of periodontitis brings about a statistically important improvement in diabetic markers, mainly HbA1c. It is necessary to continue in these studies (Ref. 34).

Cerebral CT perfusion using an interventional C-arm imaging system: cerebral blood flow measurements.

BACKGROUND AND PURPOSE: CTP imaging in the interventional suite could reduce delays to the start of image-guided interventions and help determine the treatment progress and end point. However, C-arms rotate slower than clinical CT scanners, making CTP challenging. We developed a cerebral CTP protocol for C-arm CBCT and evaluated it in an animal study. MATERIALS AND METHODS: Five anesthetized swine were imaged by using C-arm CBCT and conventional CT. The C-arm rotates in 4.3 seconds plus a 1.25-second turnaround, compared with 0.5 seconds for clinical CT. Each C-arm scan had 6 continuous bidirectional sweeps. Multiple scans each with a different delay to the start of an aortic arch iodinated contrast injection and a novel image reconstruction algorithm were used to increase temporal resolution. Three different scan sets (consisting of 6, 3, or 2 scans) and 3 injection protocols (3-mL/s 100%, 3-mL/s 67%, and 6-mL/s 50% contrast concentration) were studied. CBF maps for each scan set and injection were generated. The concordance and Pearson correlation coefficients (ρ and r) were calculated to determine the injection providing the best match between the following: the left and right hemispheres, and CT and C-arm CBCT. RESULTS: The highest ρ and r values (both 0.92) for the left and right hemispheres were obtained by using the 6-mL 50% iodinated contrast concentration injection. The same injection gave the best match for CT and C-arm CBCT for the 6-scan set (ρ = 0.77, r = 0.89). Some of the 3-scan and 2-scan protocols provided matches similar to those in CT. CONCLUSIONS: This study demonstrated that C-arm CBCT can produce CBF maps that correlate well with those from CTP.

[Tricalcium phosphate mixed with autologous bone marrow in the treatment of benign cystic bone lesions in children]. / Trikalciumfosfát v kombinaci s autologní kostní drení v lécbe cystických kostních defektu v detském veku.

PURPOSE OF THE STUDY: To test the hypothesis that the application of tricalcium phosphate (TCP) mixed with autologous bone marrow can achieve better and faster healing of benign bone lesions than the application of tricalcium phosphate granules alone. MATERIAL AND METHODS: The prospective study included two groups, each consisting of 10 patients, treated for benign cystic bone lesions at the Department of Paediatric Surgery, Orthopaedics and Trauma Surgery from July 1, 2008 to June 30, 2010. The bone cysts involved non-ossifying fibroma, enchodroma, fibrous dysplasia, aneurysmal bone cyst and juvenile bone cyst. One group was treated using ChronOS(TM) Beta-Tricalcium Phosphate (Synthes GmbH, Switzerland) granules mixed with autologous bone marrow harvested during surgery (BM group). The other (CH group) received treatment with ChronOS granules alone. Relevant clinical data were obtained from all 20 patients treated for one of the bone cyst forms mentioned above. The patients were followed up till the end of 2010. RESULTS: TCP application was a one-step procedure in both groups. In the BM group, bone regeneration ad integrum (Neer 1) was achieved, with only an occasional very small residue of the cyst seen on radiographs (Neer 2). None of the patients reported any problems, not even at 6 months after surgery. In the CH group, two patients required further surgical treatment because of insufficient bone healing (Neer 3) and two other patients reported pain persisting at the site of the lesion at 6 months post-operatively. In these patients TCP was used to fill a defect after excochleation of an aneurysmal bone cyst or fibrous dysplasia. The rest of the patients showed satisfactory healing. DISCUSSION: The main objective of the use of synthetic biocompatible materials in surgical treatment of benign bone cysts requiring filling of the lesion is to reduce the post-operative stress of paediatric patients as much as possible. Although our first results were not statistically significant to give unambiguous support to our hypothesis that lesions would heal better with the use of synthetic tricalcium phosphate mixed with autologous bone marrow, there is plenty of evidence that further development of cell technologies will result in a more exact definition of bone substitute materials in both their components, i.e., well-defined cells and non-biological scaffolds close in structure to inorganic compounds of bone, i.e., biodegradable osteoinductive materials. CONCLUSIONS: The patients with benign bone lesions treated by TCP mixed with autologous bone marrow showed neither recurrent disease nor complications. The group treated with TCP alone had recurrent lesions in two and persisting pain also in two patients. Other complications were not recorded.